[Bug 797128] videoaggregator: Notify drained status of a videoaggregator pad

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797128

--- Comment #2 from Seungha Yang <pudding8757 at gmail.com> ---
Created attachment 373613
  --> https://bugzilla.gnome.org/attachment.cgi?id=373613&action=edit
tests: compositor: Add test drained property and pad-drained signal

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